added xcode version on doc build action

.github/workflows/docs.yml

@@ -1,17 +1,20 @@
 name: Deploy Docs
 
-on:
-  push:
-    branches:
-      - 'main'
+# on:
+#   push:
+#     branches:
+#       - 'main'
 
 permissions:
   contents: write
 
 jobs:
   build-and-deploy-docs:
-    runs-on: macos-latest
+    runs-on: macos-latest            
     steps:
+      - uses: maxim-lobanov/setup-xcode@v1.6.0
+        with:
+          xcode-version: latest-stable
       - uses: actions/checkout@v2
       - name: Build Documentation
         run: swift package --allow-writing-to-directory ./docs generate-documentation --target AdaEngine --output-path ./docs --transform-for-static-hosting --hosting-base-path adaengine-docs